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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 375 · 40 questions
TalentJR

Engineer's tip (Less force, more distance): MA = load ÷ effort. Work (J) = force (N) × distance (m); force = work ÷ distance; distance = work ÷ force. Ideal ramp: MA = length ÷ height, effort = load ÷ MA.

NameDateTime takenScore ___ / 40
  1. 1.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) through a distance (d) without moving it
  2. 2.🏋️ A machine lifts a load of 360 N when you push with 120 N. What is its mechanical advantage (MA)?
  3. 3.🏋️ A force of 200 N pushes a cart 8 m along the floor. How much work is done, in joules?
  4. 4.🏋️ A machine lifts a load of 480 N when you push with 80 N. What is its mechanical advantage (MA)?
  5. 5.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 4800 N box up it, in newtons? (ideal ramp, no friction)
  6. 6.🏋️ A smooth ramp is 8 m long and rises 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  7. 7.🏋️ A force of 130 N did 650 J of work. How many metres did the object move?
  8. 8.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  9. 9.🏋️ A force of 270 N pushes a cart 7 m along the floor. How much work is done, in joules?
  10. 10.🏋️ A force of 80 N did 560 J of work. How many metres did the object move?
  11. 11.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
  12. 12.🏋️ A force of 20 N pushes a cart 5 m along the floor. How much work is done, in joules?
  13. 13.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
  14. 14.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 1000 N box up it, in newtons? (ideal ramp, no friction)
  15. 15.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) yes, by half (d) only on Mondays
  16. 16.🏋️ A force of 470 N pushes a cart 8 m along the floor. How much work is done, in joules?
  17. 17.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
  18. 18.🏋️ A force of 460 N pushes a cart 7 m along the floor. How much work is done, in joules?
  19. 19.🏋️ A force of 400 N did 400 J of work. How many metres did the object move?
  20. 20.🏋️ A 12 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  21. 21.🏋️ Pushing a crate 7 m took 3430 J of work. What force was used, in newtons?
  22. 22.🏋️ A 14 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ Pushing a crate 1 m took 90 J of work. What force was used, in newtons?
  24. 24.🏋️ A force of 160 N did 800 J of work. How many metres did the object move?
  25. 25.🏋️ Pushing a crate 5 m took 600 J of work. What force was used, in newtons?
  26. 26.🏋️ A force of 60 N pushes a cart 4 m along the floor. How much work is done, in joules?
  27. 27.🏋️ Pushing a crate 6 m took 1680 J of work. What force was used, in newtons?
  28. 28.🏋️ A machine lifts a load of 80 N when you push with 20 N. What is its mechanical advantage (MA)?
  29. 29.🏋️ A longer ramp to the same height needs … (a) less effort (b) more effort (c) no effort (d) the same effort
  30. 30.🏋️ An 11 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  31. 31.🏋️ A 5 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  32. 32.🏋️ A machine lifts a load of 750 N when you push with 150 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ A machine lifts a load of 180 N when you push with 90 N. What is its mechanical advantage (MA)?
  34. 34.🏋️ A force of 40 N pushes a cart 5 m along the floor. How much work is done, in joules?
  35. 35.🏋️ A force of 290 N did 290 J of work. How many metres did the object move?
  36. 36.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
  37. 37.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) metre (m) (d) watt hour
  38. 38.🏋️ A machine lifts a load of 400 N when you push with 80 N. What is its mechanical advantage (MA)?
  39. 39.🏋️ A force of 140 N pushes a cart 1 m along the floor. How much work is done, in joules?
  40. 40.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?

Answer key

  1. through a distance
  2. 3
  3. 1600
  4. 6
  5. 800
  6. 450
  7. 5
  8. 2
  9. 1890
  10. 7
  11. 3
  12. 100
  13. 300
  14. 200
  15. no, work stays the same
  16. 3760
  17. 100
  18. 3220
  19. 1
  20. 240
  21. 490
  22. 420
  23. 90
  24. 5
  25. 120
  26. 240
  27. 280
  28. 4
  29. less effort
  30. 550
  31. 150
  32. 5
  33. 2
  34. 200
  35. 1
  36. 900
  37. joule (J)
  38. 5
  39. 140
  40. 2

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